From b86517f1b390cf8fd13611aef6e65b472ff7e813 Mon Sep 17 00:00:00 2001
From: Mart Lubbers <mart@martlubbers.net>
Date: Fri, 20 May 2016 16:20:41 +0200
Subject: [PATCH] add funtype

---
 AST.dcl |  1 +
 AST.icl |  1 +
 gen.icl | 18 +++++++++---------
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/AST.dcl b/AST.dcl
index ad3196f..4a5a6cb 100644
--- a/AST.dcl
+++ b/AST.dcl
@@ -15,6 +15,7 @@ from StdOverloaded import class toString, class ==, class zero, class <
 	| BoolType
 	| CharType
     | VoidType
+	| FuncType Type
     | (->>) infixl 7 Type Type
 :: Expr 
 	= VarExpr Pos VarDef
diff --git a/AST.icl b/AST.icl
index 24d2af1..6436619 100644
--- a/AST.icl
+++ b/AST.icl
@@ -65,6 +65,7 @@ instance print Type where
 	print BoolType = print "Bool"
 	print CharType = print "Char"
     print VoidType = print "Void"
+    print (FuncType t) = ["(-> ":print t] ++ [")"]
     print (t1 ->> t2) = ["(":print t1 ++ [" -> ":print t2]] ++ [")"]
 
 instance print String where
diff --git a/gen.icl b/gen.icl
index bf3d7c4..b4b9992 100644
--- a/gen.icl
+++ b/gen.icl
@@ -33,18 +33,18 @@ FALSE :== 0
 :: SSMProgram :== [Instr]
 :: GenError = Error String
 :: Addressbook :== 'Map'.Map String Address
-:: Address = LAB String | ADDR Int
+:: Address = LAB String Int | ADDR Int
 :: Gen a :== RWST () SSMProgram (Addressbook, [Label]) (Either GenError) a
 
 labelStream :: [Label]
 labelStream = ["lbl_" +++ toString i\\i<-[1..]]
 
 defaultAddressBook :: Addressbook 
-defaultAddressBook = extend "1printint" (LAB "1printint")
-	$ extend "1printchar" (LAB "1printchar")
-	$ extend "1readchar" (LAB "1readchar")
-	$ extend "1readint" (LAB "1readint")
-	$ extend "isEmpty" (LAB "isempty")
+defaultAddressBook = extend "1printint" (LAB "1printint" 1)
+	$ extend "1printchar" (LAB "1printchar" 1)
+	$ extend "1readchar" (LAB "1readchar" 0)
+	$ extend "1readint" (LAB "1readint" 0)
+	$ extend "isEmpty" (LAB "isempty" 1)
 	'Map'.newMap
 
 gen :: AST -> Either String String
@@ -169,7 +169,7 @@ instance g Expr where
 jump :: String String -> Gen ()
 jump instr k = getAdressbook >>= \ab->case 'Map'.get k ab of
 	Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
-	Just (LAB t) = tell [Instr instr [L t] (k +++"()")]
+	Just (LAB t _) = tell [Instr instr [L t] (k +++"()")]
 	Just (ADDR t) = liftT (Left $ Error $ "PANIC: jump should go to label")
 
 instance g Stmt where
@@ -195,7 +195,7 @@ instance g Stmt where
     g (AssStmt (VarDef k fs) e) = 
         g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
-            Just (LAB t) = liftT (Left $ Error $ "PANIC: cannot assign to function")
+            Just (LAB t _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
             Just (ADDR t) = tell [Instr "stl" [Lit t] ""]
     g (FunStmt k es fs) = mapM_ g es 
         >>| jump "bsr" k
@@ -220,7 +220,7 @@ addVars [x:xs] = \ab->extend x (ADDR (-2 - (length xs))) (addVars xs ab)
 instance g FunDecl where
     g (FunDecl _ k args _ vds stms) = 
         //varDecls can call the enclosing function, so first reserve a label for it 
-        updateAdressbook (extend k (LAB k)) >>|
+        updateAdressbook (extend k (LAB k (length args))) >>|
         getAdressbook >>= \oldMap ->
 		updateAdressbook (addVars args) >>|
         tell [Lab k] >>|
-- 
2.20.1